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Fitting Android and a processor on a SIM card

"The SIM cards in cellular telephones might be smaller
than a postage stamp and less than a millimeter thick but that
hasn't stopped South Korea's SK Telecom from cramming all the major
components needed to run Google's Android OS inside one of them.

"The carrier's Android SIM, a prototype of which is on show at
this week's Mobile World Congress in Barcelona, includes an
ARM-based processor, companion memory and 1GB of flash memory to
store the OS and other data."